is the seller.

a Use Ernie’s supply schedule and Bert’s demand schedule to find the quantity supplied and quantity demanded at prices of $2, $4 and $6. Which of these prices brings supply and demand into equilibrium?

b What are consumer surplus, producer surplus and total surplus in this equilibrium?

c If Ernie produced and Bert consumed one less bottle of water, what would happen to total surplus?

d If Ernie produced and Bert consumed one additional bottle of water, what would happen to total surplus?